Waec Chemistry Past Questions For Year 2009

Question 6

An element Q forms a compound QCI₅. In which group of the periodic table is Q?

waec 2009

• A. l
• B. lll
• C. V
• D. VII

Question 7

Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?

waec 2009

• A. 1s² 2s² 2p²
• B. 1s² 2s² 2p⁶
• C. 1s² 2s² 2p⁶ 3s² 3p⁴
• D. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

Question 8

Which of the following ions is isoelectronic with neon? [₃Li, _{3F, 10Ne, 17CI,19K]}

waec 2009

• A. CI^-
• B. F^-
• C. K⁺
• D. Li,⁺

Question 9

The following properties are characteristics of transition elements except

waec 2009

• A. formation of complex ions
• B. fixed oxidation states
• C. formation of coloured compounds
• D. catalytic abilities

Question 10

Which of the following elements has the electronic configuration:1s²2s²2p⁶3s²3p¹? [₁₁Na, ₁₃A1,

₁₄N,₁₆S]

waec 2009

• A. Al
• B. Na
• C. N
• D. S